:root{
  --brand:#2563eb;
  --accent:#06b6d4;
  --bg:#f8fafc;
  --ink:#0f172a;
  --line:#e2e8f0;
  --muted:#64748b;
  --radius:8px;
  --shadow:0 1px 2px rgba(15,23,42,.05),0 6px 18px rgba(15,23,42,.045);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  background:var(--bg);
  color:var(--ink);
  font-family:"Inter","PingFang SC","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  font-weight:400;
  line-height:1.85;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4,.x-tight{font-weight:900;letter-spacing:-.015em;line-height:1.3}
a{color:var(--brand);text-decoration:none}
a:hover{color:var(--accent)}

/* ===== nav ===== */
.x-nav{
  position:sticky;top:0;z-index:1030;
  background:rgba(248,250,252,.72);
  backdrop-filter:blur(12px);
  border-bottom:1px solid transparent;
  transition:background .35s ease,border-color .35s ease,box-shadow .35s ease;
}
.x-nav.is-stuck{
  background:rgba(255,255,255,.94);
  border-bottom-color:var(--line);
  box-shadow:0 4px 16px rgba(15,23,42,.05);
}
.x-brand{
  font-weight:900;font-size:1.24rem;color:var(--ink);letter-spacing:-.02em;
  display:inline-flex;align-items:center;gap:.5rem;
}
.x-brand:hover{color:var(--brand)}
.x-brand .x-dot{
  width:26px;height:26px;border-radius:7px;display:inline-flex;align-items:center;justify-content:center;
  background:linear-gradient(135deg,var(--brand),var(--accent));color:#fff;font-size:.78rem;
}
.x-nav .nav-link{
  color:var(--muted);font-weight:600;font-size:.94rem;padding:.5rem .85rem!important;
  border-radius:6px;transition:color .2s,background .2s;
}
.x-nav .nav-link:hover{color:var(--brand);background:rgba(37,99,235,.07)}
.x-nav .nav-link.active{color:var(--brand)}
.navbar-toggler{border:1px solid var(--line);border-radius:6px;padding:.28rem .5rem}
.navbar-toggler:focus{box-shadow:none}

/* ===== hero ===== */
.x-hero{
  position:relative;overflow:hidden;
  padding:clamp(58px,9vw,110px) 0 clamp(48px,7vw,88px);
  background:
    radial-gradient(900px 420px at 88% -10%,rgba(6,182,212,.16),transparent 62%),
    radial-gradient(760px 400px at 4% 108%,rgba(37,99,235,.14),transparent 60%),
    #fff;
  border-bottom:1px solid var(--line);
}
.x-shape{position:absolute;pointer-events:none;opacity:.5}
.x-s1{width:120px;height:120px;border-radius:50%;background:rgba(37,99,235,.12);top:12%;left:-42px}
.x-s2{width:76px;height:76px;background:rgba(6,182,212,.16);border-radius:8px;top:64%;right:8%;transform:rotate(18deg)}
.x-s3{width:0;height:0;border-left:34px solid transparent;border-right:34px solid transparent;border-bottom:58px solid rgba(37,99,235,.10);top:14%;right:20%}
.x-s4{width:52px;height:52px;border-radius:50%;background:rgba(6,182,212,.13);bottom:8%;left:16%}
.x-s5{width:96px;height:96px;border-radius:8px;background:rgba(37,99,235,.07);bottom:-34px;right:32%;transform:rotate(-12deg)}
.x-hero h1{
  font-size:clamp(1.95rem,4.6vw,3.3rem);
  margin:0 0 1rem;
}
.x-hero h1 .x-grad{
  background:linear-gradient(100deg,var(--brand),var(--accent));
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.x-hero-lead{
  font-size:clamp(1rem,1.6vw,1.14rem);
  color:var(--muted);max-width:640px;margin:0 auto 1.9rem;line-height:1.95;
}
.x-btn{
  display:inline-flex;align-items:center;gap:.5rem;
  padding:.74rem 1.5rem;border-radius:var(--radius);
  font-weight:700;font-size:.96rem;border:1px solid transparent;
  transition:transform .2s ease,box-shadow .2s ease,background .2s ease,color .2s;
}
.x-btn-main{background:var(--brand);color:#fff;box-shadow:0 6px 18px rgba(37,99,235,.26)}
.x-btn-main:hover{background:#1d4ed8;color:#fff;transform:translateY(-2px)}
.x-btn-ghost{background:#fff;color:var(--ink);border-color:var(--line)}
.x-btn-ghost:hover{border-color:var(--brand);color:var(--brand);transform:translateY(-2px)}
.x-hero-tags{margin-top:1.7rem;display:flex;flex-wrap:wrap;gap:.5rem;justify-content:center}
.x-hero-tags span{
  font-size:.8rem;font-weight:600;color:var(--muted);
  background:#fff;border:1px solid var(--line);border-radius:100px;padding:.24rem .78rem;
}

/* ===== section ===== */
.x-sec{padding:clamp(46px,7vw,76px) 0}
.x-sec-white{background:#fff;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.x-eyebrow{
  display:inline-flex;align-items:center;gap:.42rem;
  font-size:.76rem;font-weight:800;letter-spacing:.16em;text-transform:uppercase;
  color:var(--brand);background:rgba(37,99,235,.08);
  border-radius:100px;padding:.28rem .82rem;margin-bottom:1rem;
}
.x-sec-title{font-size:clamp(1.42rem,2.7vw,2.05rem);margin:0 0 .7rem}
.x-sec-sub{color:var(--muted);max-width:690px;margin:0 0 2.2rem;line-height:1.95}

/* ===== stats ===== */
.x-stat{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:1.5rem 1.2rem;height:100%;box-shadow:var(--shadow);
  transition:transform .22s ease,border-color .22s ease;
}
.x-stat:hover{transform:translateY(-3px);border-color:rgba(37,99,235,.4)}
.x-stat b{
  display:block;font-family:"SFMono-Regular",Menlo,Consolas,monospace;
  font-size:clamp(1.7rem,3.4vw,2.3rem);font-weight:700;color:var(--brand);
  letter-spacing:-.02em;line-height:1.1;
}
.x-stat span{display:block;font-size:.9rem;color:var(--muted);margin-top:.35rem}

/* ===== steps ===== */
.x-steps{display:grid;gap:1.1rem;grid-template-columns:1fr}
@media(min-width:768px){.x-steps{grid-template-columns:repeat(2,1fr)}}
@media(min-width:1100px){.x-steps{grid-template-columns:repeat(4,1fr)}}
.x-step{
  position:relative;background:#fff;border:1px solid var(--line);
  border-radius:var(--radius);padding:1.5rem 1.3rem 1.3rem;height:100%;
}
.x-step-n{
  font-family:"SFMono-Regular",Menlo,Consolas,monospace;
  font-size:.82rem;font-weight:700;color:#fff;background:var(--brand);
  width:30px;height:30px;border-radius:7px;display:inline-flex;align-items:center;justify-content:center;
  margin-bottom:.85rem;
}
.x-step h4{font-size:1.03rem;margin:0 0 .5rem}
.x-step p{margin:0;font-size:.92rem;color:var(--muted);line-height:1.9}

/* ===== features ===== */
.x-feat{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:1.6rem 1.4rem;height:100%;transition:transform .22s ease,box-shadow .22s ease;
}
.x-feat:hover{transform:translateY(-3px);box-shadow:0 10px 26px rgba(15,23,42,.07)}
.x-feat i{
  font-size:1rem;color:#fff;width:38px;height:38px;border-radius:8px;
  display:inline-flex;align-items:center;justify-content:center;margin-bottom:1rem;
  background:linear-gradient(135deg,var(--brand),var(--accent));
}
.x-feat h4{font-size:1.05rem;margin:0 0 .5rem}
.x-feat p{margin:0;font-size:.92rem;color:var(--muted);line-height:1.9}

/* ===== poster grid ===== */
.x-poster-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:1rem}
@media(min-width:576px){.x-poster-grid{grid-template-columns:repeat(3,1fr)}}
@media(min-width:992px){.x-poster-grid{grid-template-columns:repeat(4,1fr)}}
@media(min-width:1400px){.x-poster-grid{grid-template-columns:repeat(6,1fr)}}
.x-card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  overflow:hidden;width:100%;transition:transform .22s ease,box-shadow .22s ease,border-color .22s ease;
}
.x-card:hover{transform:translateY(-4px);box-shadow:0 12px 26px rgba(15,23,42,.10);border-color:rgba(37,99,235,.35)}
.x-poster{
  position:relative;width:100%;aspect-ratio:2/3;overflow:hidden;background:#e9eef5;
}
.x-poster img{
  width:100%;height:100%;object-fit:cover;display:block;
  opacity:0;transition:opacity .55s ease,transform .4s ease;
}
.x-poster img.x-loaded{opacity:1}
.x-card:hover .x-poster img{transform:scale(1.05)}
.x-play{
  position:absolute;inset:0;display:flex;align-items:center;justify-content:center;
  background:linear-gradient(180deg,rgba(15,23,42,.05),rgba(15,23,42,.5));
  opacity:0;transition:opacity .25s ease;
}
.x-card:hover .x-play{opacity:1}
.x-play i{
  width:48px;height:48px;border-radius:50%;background:rgba(255,255,255,.94);
  color:var(--brand);display:inline-flex;align-items:center;justify-content:center;
  font-size:1rem;transform:scale(.82);transition:transform .25s ease;
}
.x-card:hover .x-play i{transform:scale(1)}
.x-tag{
  position:absolute;top:.5rem;left:.5rem;z-index:2;
  font-size:.68rem;font-weight:700;color:#fff;background:rgba(37,99,235,.92);
  border-radius:100px;padding:.16rem .56rem;
}
.x-card-body{padding:.78rem .8rem .92rem}
.x-card-body h3{
  font-size:.88rem;font-weight:700;margin:0 0 .22rem;color:var(--ink);
  overflow:hidden;text-overflow:ellipsis;white-space:nowrap;
}
.x-card-body p{margin:0;font-size:.76rem;color:var(--muted)}

/* ===== faq ===== */
.x-faq{max-width:860px}
.x-faq-item{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  margin-bottom:.85rem;overflow:hidden;
}
.x-faq-q{
  width:100%;text-align:left;background:none;border:0;padding:1.05rem 1.15rem;
  font-weight:700;font-size:.98rem;color:var(--ink);display:flex;justify-content:space-between;
  align-items:center;gap:1rem;cursor:pointer;line-height:1.6;
}
.x-faq-q i{color:var(--brand);transition:transform .25s ease;font-size:.85rem;flex:0 0 auto}
.x-faq-item.open .x-faq-q i{transform:rotate(45deg)}
.x-faq-a{
  max-height:0;overflow:hidden;transition:max-height .32s ease;
  padding:0 1.15rem;color:var(--muted);font-size:.92rem;
}
.x-faq-item.open .x-faq-a{padding-bottom:1.1rem}

/* ===== cta ===== */
.x-cta{
  position:relative;overflow:hidden;border-radius:var(--radius);
  background:linear-gradient(120deg,#1d4ed8,#2563eb 46%,#06b6d4);
  color:#fff;padding:clamp(2.1rem,5vw,3.4rem);text-align:center;
}
.x-cta .x-s1{background:rgba(255,255,255,.12);opacity:.9}
.x-cta .x-s2{background:rgba(255,255,255,.14);opacity:.9}
.x-cta h2{font-size:clamp(1.5rem,3vw,2.15rem);margin:0 0 .8rem}
.x-cta p{margin:0 auto 1.7rem;max-width:620px;color:rgba(255,255,255,.88);line-height:1.95}
.x-btn-light{background:#fff;color:var(--brand);font-weight:800}
.x-btn-light:hover{background:#e8f0ff;color:#1d4ed8;transform:translateY(-2px)}
.x-btn-outline{background:transparent;color:#fff;border-color:rgba(255,255,255,.6)}
.x-btn-outline:hover{background:rgba(255,255,255,.14);color:#fff;transform:translateY(-2px)}

/* ===== footer ===== */
.x-footer{background:#fff;border-top:1px solid var(--line);padding:clamp(42px,6vw,64px) 0 0}
.x-footer h5{font-size:.82rem;letter-spacing:.13em;text-transform:uppercase;color:var(--muted);font-weight:800;margin-bottom:.95rem}
.x-footer ul{list-style:none;padding:0;margin:0}
.x-footer li{margin-bottom:.5rem}
.x-footer li a,.x-footer p a{color:var(--muted);font-size:.9rem}
.x-footer li a:hover,.x-footer p a:hover{color:var(--brand)}
.x-friend{
  border:1px dashed var(--line);border-radius:var(--radius);
  background:var(--bg);padding:1.1rem 1.2rem;
}
.x-friend .x-friend-label{font-size:.78rem;font-weight:800;letter-spacing:.13em;text-transform:uppercase;color:var(--muted);margin-bottom:.55rem}
.x-friend-body{font-size:.86rem;color:var(--muted);line-height:2;word-break:break-all}
.x-copy{
  border-top:1px solid var(--line);margin-top:2.6rem;padding:1.15rem 0;
  font-size:.84rem;color:var(--muted);
}
@media (max-width:991.98px){
  .x-nav .navbar-collapse{
    background:#fff;border:1px solid var(--line);border-radius:var(--radius);
    margin-top:.6rem;padding:.5rem;
  }
}

/* --- 子页面追加 --- */
/* 本页专属少量补充样式，复用站点变量 */
  .x-about-hero {padding:72px 0 40px;background:linear-gradient(180deg,#eef4ff 0%,var(--bg) 100%);position:relative;overflow:hidden}
.x-about-hero h1 {font-weight:900;font-size:clamp(1.8rem,4.2vw,2.9rem);line-height:1.25;color:var(--ink);letter-spacing:-.5px}
.x-about-hero p.x-hero-lead {color:var(--muted);font-size:1.05rem;max-width:760px;margin-top:16px}
.x-about-card {background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:26px 24px;height:100%}
.x-about-card h3 {font-size:1.08rem;font-weight:800;color:var(--ink);margin-bottom:10px}
.x-about-card p {color:var(--muted);font-size:.95rem;line-height:1.75;margin:0}
.x-about-num {display:inline-flex;align-items:center;justify-content:center;width:34px;height:34px;border-radius:8px;background:rgba(37,99,235,.1);color:var(--brand);font-weight:800;font-size:.9rem;margin-bottom:12px}
.x-timeline {list-style:none;padding:0;margin:0;border-left:2px solid var(--line);margin-left:6px}
.x-timeline li {position:relative;padding:0 0 26px 24px}
.x-timeline li:last-child {padding-bottom:0}
.x-timeline li::before {content:"";position:absolute;left:-7px;top:5px;width:12px;height:12px;border-radius:50%;background:var(--brand);border:2px solid #fff;box-shadow:0 0 0 2px rgba(37,99,235,.18)}
.x-timeline .x-tl-date {font-weight:800;color:var(--ink);font-size:.95rem}
.x-timeline .x-tl-txt {color:var(--muted);font-size:.92rem;line-height:1.7;margin-top:4px}
.x-rule-list {list-style:none;padding:0;margin:0}
.x-rule-list li {display:flex;gap:12px;padding:14px 0;border-bottom:1px dashed var(--line);color:var(--muted);font-size:.95rem;line-height:1.7}
.x-rule-list li:last-child {border-bottom:none}
.x-rule-list li i {color:var(--accent);margin-top:4px}
.x-about-quote {background:#fff;border:1px solid var(--line);border-left:4px solid var(--brand);border-radius:var(--radius);padding:22px 24px;box-shadow:var(--shadow);color:var(--ink);font-size:1.02rem;line-height:1.85;font-weight:500}
.x-about-quote span {display:block;margin-top:12px;color:var(--muted);font-size:.88rem;font-weight:600}

/* --- 子页面追加 --- */
.x-legal-wrap {max-width:900px;margin:0 auto;}
.x-legal-meta {font-size:.86rem;color:var(--muted);margin-bottom:2rem;}
.x-legal-card {background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:1.6rem 1.5rem;margin-bottom:1.4rem;}
.x-legal-card h2 {font-size:1.18rem;font-weight:700;color:var(--ink);margin-bottom:.9rem;display:flex;align-items:center;gap:.55rem;}
.x-legal-card h2 i {color:var(--brand);font-size:1rem;}
.x-legal-card h3 {font-size:1rem;font-weight:600;color:var(--ink);margin:1.1rem 0 .5rem;}
.x-legal-card p {color:var(--muted);font-size:.95rem;line-height:1.85;margin-bottom:.7rem;}
.x-legal-card ul {color:var(--muted);font-size:.95rem;line-height:1.85;padding-left:1.15rem;margin-bottom:.7rem;}
.x-legal-card li {margin-bottom:.35rem;}
.x-legal-card a {color:var(--brand);text-decoration:none;}
.x-legal-card a:hover {text-decoration:underline;}
.x-legal-note {background:rgba(37,99,235,.06);border-left:3px solid var(--brand);border-radius:6px;padding:.85rem 1rem;font-size:.9rem;color:var(--ink);line-height:1.8;}
.x-toc {background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:1.2rem 1.4rem;margin-bottom:2rem;}
.x-toc-title {font-weight:700;color:var(--ink);font-size:.95rem;margin-bottom:.7rem;}
.x-toc a {display:inline-block;color:var(--brand);font-size:.9rem;text-decoration:none;margin:.2rem .9rem .2rem 0;}
.x-toc a:hover {text-decoration:underline;}

/* --- 子页面追加 --- */
.g-hero {padding:56px 0 30px;background:var(--bg);}
.g-hero h1 {font-size:clamp(1.7rem,3.6vw,2.6rem);font-weight:800;color:var(--ink);line-height:1.25;margin-bottom:14px;}
.g-hero p {color:var(--muted);max-width:760px;font-size:1.02rem;line-height:1.85;}
.g-card {background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:22px 22px 18px;height:100%;}
.g-card h3 {font-size:1.06rem;font-weight:700;color:var(--ink);margin-bottom:10px;display:flex;align-items:center;gap:8px;}
.g-card h3 i {color:var(--brand);}
.g-card p,.g-card li {color:var(--muted);font-size:.94rem;line-height:1.8;}
.g-card ul {padding-left:18px;margin:0;}
.g-tbl {width:100%;border-collapse:collapse;background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);}
.g-tbl th,.g-tbl td {padding:13px 16px;text-align:left;font-size:.93rem;border-bottom:1px solid var(--line);color:var(--ink);}
.g-tbl th {background:#eff6ff;color:var(--brand);font-weight:700;}
.g-tbl tr:last-child td {border-bottom:none;}
.g-tbl td:first-child {font-weight:600;}
.g-tip {background:#ecfeff;border-left:3px solid var(--accent);border-radius:var(--radius);padding:14px 18px;color:var(--ink);font-size:.93rem;line-height:1.8;}
.g-qa {background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:18px 20px;margin-bottom:14px;}
.g-qa h3 {font-size:1rem;font-weight:700;color:var(--ink);margin-bottom:8px;}
.g-qa p {color:var(--muted);font-size:.93rem;line-height:1.8;margin:0;}
.g-nav-inline {display:flex;flex-wrap:wrap;gap:10px;margin-top:18px;}
.g-nav-inline a {font-size:.88rem;color:var(--brand);border:1px solid var(--line);background:#fff;border-radius:99px;padding:6px 14px;text-decoration:none;transition:.2s;}
.g-nav-inline a:hover {background:var(--brand);color:#fff;border-color:var(--brand);}

/* --- 子页面追加 --- */
.sm-card {background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:22px 22px 18px;height:100%}
.sm-card h3 {font-size:1.05rem;font-weight:800;color:var(--ink);margin:0 0 6px;display:flex;align-items:center;gap:8px}
.sm-card h3 i {color:var(--brand)}
.sm-card .sm-desc {color:var(--muted);font-size:.9rem;margin-bottom:14px;line-height:1.7}
.sm-links {list-style:none;margin:0;padding:0}
.sm-links li {margin-bottom:9px}
.sm-links a {display:flex;align-items:flex-start;gap:9px;text-decoration:none;color:var(--ink);font-size:.93rem;font-weight:600;padding:8px 10px;border-radius:6px;transition:.18s;border:1px solid transparent}
.sm-links a:hover {background:rgba(37,99,235,.06);border-color:rgba(37,99,235,.18);color:var(--brand)}
.sm-links a i {color:var(--accent);margin-top:3px;font-size:.8rem}
.sm-links a span small {display:block;color:var(--muted);font-weight:400;font-size:.8rem;margin-top:2px;line-height:1.6}
.sm-path {font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.76rem;color:var(--muted);background:var(--bg);border:1px solid var(--line);padding:1px 6px;border-radius:4px;margin-left:auto;white-space:nowrap}
.sm-note {background:linear-gradient(135deg,rgba(37,99,235,.07),rgba(6,182,212,.07));border:1px solid var(--line);border-radius:var(--radius);padding:18px 20px}
.sm-note h4 {font-size:.98rem;font-weight:800;color:var(--ink);margin:0 0 8px}
.sm-note p {color:var(--muted);font-size:.9rem;line-height:1.75;margin:0}
.sm-tree {font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.82rem;line-height:2;color:var(--muted);background:var(--bg);border:1px solid var(--line);border-radius:var(--radius);padding:18px 20px;overflow-x:auto}
.sm-tree b {color:var(--ink)}
.sm-tree em {color:var(--brand);font-style:normal}